Die biologische Wirkung von staub- und gasfrmigen Immissionen/Die Technik im Dienste moderner kardiologischer Diagnostik

Important among the various sources of emission are domestic heating and motor vehicles. Incomplete combustion causes most emissin. Macro-climatic and micr-climatic conditions are highly significant in the spread
and density f air pollutin. Although nly unpleasant smell or soiling air pollutin have caused offen ce, we must recognize and examine the main harmful gaseous and powdery ingredients, particularly thse with lasting
harmful effect. Thus, of interest amng powdery emissions are only the suspended particles 5 p), because only they can penetrate the lungs. Sedimentation methods are therefore nt suited to infrm us n dust aero soles
injurious to health. The mst important emissions are cancerogenic substances such as 3,4-benzpyren. Under special conditins, animal experi ments shw that these substances are able to cause bronchial tumours. The increase
in lung cancer appears t be assciated with high air pllution in cities; the mst frequently and increasingly proved gaseous emissions are S02, CO and N0 . 2 Mre imprtant than the individual components is the examinatin
of the combinatin of various gaseous and pwdery air pollutins. The catastrophes in London, Donora and in the Maas valley, and special conditions in Los Angeles, are significant examples f the importance f air hygiene.
Towards the maintenance of clean air, filters can be mounted in chimneys, although filter efficiency drops appreciably with a grain size f < 5 p.